diff --git a/calendar.js b/calendar.js
index 4fdbd2f..9294ac0 100644
--- a/calendar.js
+++ b/calendar.js
@@ -17,9 +17,7 @@ export default class DatePickView extends Component {
   }
 
   passDateToDayView(result) {
-    // TODO this also has date as a string, perhaps useful for LocalDateFormat
-    const date = new Date(result.year, result.month - 1, result.day)
-    const cycleDay = getOrCreateCycleDay(date)
+    const cycleDay = getOrCreateCycleDay(result.dateString)
     const navigate = this.props.navigation.navigate
     navigate('dayView', { cycleDay })
   }
@@ -40,8 +38,7 @@ export default class DatePickView extends Component {
 function getBleedingDaysInCalFormat(bleedingDaysSortedByDate) {
   const shadesOfRed = ['#ffbaba', '#ff7b7b', '#ff5252', '#ff0000']
   return bleedingDaysSortedByDate.reduce((acc, day) => {
-    const dateString = day.date.toISOString().slice(0, 10)
-    acc[dateString] = { startingDay: true, endingDay: true, color: shadesOfRed[day.bleeding.value] }
+    acc[day.date] = { startingDay: true, endingDay: true, color: shadesOfRed[day.bleeding.value] }
     return acc
   }, {})
 }
diff --git a/db.js b/db.js
index b1a6406..dd2648e 100644
--- a/db.js
+++ b/db.js
@@ -1,9 +1,7 @@
 import realm from 'realm'
-import { v4 as uuid } from 'uuid'
 
 let db
 let cycleDaysSortedbyTempValueView = []
-let cycleDaysSortedbyDate = []
 let bleedingDaysSortedByDate = []
 
 const TemperatureSchema = {
@@ -24,10 +22,9 @@ const BleedingSchema = {
 
 const CycleDaySchema = {
   name: 'CycleDay',
-  primaryKey: 'key',
+  primaryKey: 'date',
   properties: {
-    key: 'string',
-    date: 'date',
+    date: 'string',
     temperature: {
       type: 'Temperature',
       optional: true
@@ -52,14 +49,12 @@ async function openDatabase() {
   // just for testing purposes, the highest temperature will be topmost
   // because I was too layz to make a scroll view
   cycleDaysSortedbyTempValueView = db.objects('CycleDay').filtered('temperature != null').sorted('temperature.value', true)
-  cycleDaysSortedbyDate = db.objects('CycleDay').sorted('date', true)
   bleedingDaysSortedByDate = db.objects('CycleDay').filtered('bleeding != null').sorted('date', true)
 }
 
 function saveTemperature(date, temperature) {
   db.write(() => {
     const doc = {
-      key: uuid(),
       date,
       temperature
     }
@@ -73,13 +68,12 @@ function saveBleeding(cycleDay, bleeding) {
   })
 }
 
-function getOrCreateCycleDay(date) {
-  let result = Array.from(cycleDaysSortedbyDate.filtered('date = $0', date))[0]
+function getOrCreateCycleDay(localDate) {
+  let result = db.objectForPrimaryKey('CycleDay', localDate)
   if (!result) {
     db.write(() => {
       result = db.create('CycleDay', {
-        key: uuid(),
-        date
+        date: localDate
       })
     })
   }